From ad3c76b6d9891c77d06ac8b849119b40ef97a64d Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Wed, 7 Apr 2021 03:05:57 +0900
Subject: [PATCH] internal/uidriver/js: Bug fix: CursorPosition crashed before
 the main loop on browsers

Closes #1559
---
 internal/uidriver/js/input_js.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/internal/uidriver/js/input_js.go b/internal/uidriver/js/input_js.go
index 1727a6ab0..c438ee0cb 100644
--- a/internal/uidriver/js/input_js.go
+++ b/internal/uidriver/js/input_js.go
@@ -83,6 +83,9 @@ type Input struct {
 }
 
 func (i *Input) CursorPosition() (x, y int) {
+	if i.ui.context == nil {
+		return 0, 0
+	}
 	xf, yf := i.ui.context.AdjustPosition(float64(i.cursorX), float64(i.cursorY), i.ui.DeviceScaleFactor())
 	return int(xf), int(yf)
 }